Amibroker Money Management

Having trouble with a part of my money mangement logic in **Amibroker**, which I am not able to solve. ? My money management is based on the following principle: ? 1. Invest only 2% of total Equity per Trade 2. Invest only 6% of total Equity on all open Trades 3. Currently my Stops/Risk is at 5% ? Problem with my current formula is that my PositionSize is based on total Equity. It should be based on my Total Risk. ? Free Risk = Total Risk (6% of Total Equity) - Risk of open Positions (5% of the Buy/ Sell Price times No.. of Shares) ? Can you help me with that piece of programming logic, which than also enters trades and takes the remaining free risk and allocates it to a trade?